Solutions to technological difficulty of dry wellbore cementing

With increasing domestic in-situ experiment about dry wellbore cementing, some shortcomings are also gradually exposed. Combined literatures at home and abroad with field construction information and data about dry wellbore cementing, the technical superiority and technical difficulties are summarized in this paper. Aiming at the existing difficulties of collapse and lost circulation of cementing in weak formation for dry wellbore, the technology measures are put forward, including positive injecting and negative infusing cement slurry in empty hole, insert type cementing technique, two-stage primary cement, etc. The downhole throttling floating hoop is suggested to apply to manage the strong gravity effects in the process of cementing for dry wellbore, which can slow the cement slurry free falling speed, and avoid complex downhole problems resulted from excessive high cement slurry flowback speed.